问题
选择题
The man is____ a serious nervous breakdown because he is unable to deal with pressure from daily life.
A．at the edge of
B．on the edge of
C．on behalf of
D．on the top of
答案
答案：B
考查介词短语辨析。句意：这个人因不能处理日常生活得压力而处于心理崩溃的边缘。On the edge of 正处于----的边缘符合句意；at the edge of 在----的边缘；on behalf of代表；on the top of在---的顶部。